dent formation is<br>related to a formed vacuole within the particle soon after skin development on the surface. As the particle temperature exceeds the local<br>ambient boiling point, the vacuole inflates and the vapor pressure within<br>the vacuole rises above the local ambient pressure. The moisture evaporates very quickly when the drying temperature is sufficiently high, and<br>the skin becomes dry and hard. For this reason, as the particle moves to<br>the cooler regions of the drier, the vapor can not retain its hollow particulate when concentrated in the vacuum. However, when the drying<br>temperature is lower, the skin is being moist and stretched for a longer<br>time, so that the hollow particle can deflate and shrivel as it cools.
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